JPH0643643Y2 - Cold storage type refrigerator - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention is provided with a compression mechanism and an expansion mechanism having a regenerator, and has a GM cycle refrigerator, a Stirling cycle refrigerator,
The present invention relates to a cold storage type refrigerating device used as a low temperature generating device such as a sorby cycle refrigerator.

(B) Conventional technology As described in the cryogenic engineering handbook (September 15, 1982, Uchida Lao Tsukuba Shinsha P103-P107), the compression mechanism of the GM cycle refrigerator and the Stirling cycle refrigerator described above is used. And an expansion mechanism having a regenerator.

FIG. 3 shows an example of a conventional GM cycle refrigerator. In FIG. 3, the compression mechanism 1 has an adsorber 4 and an inlet-side valve 5 sequentially installed in a discharge-side pipe 3 of a compressor 2, and an outlet-side valve 7 installed in a suction-side pipe 6 of the compressor 2. I am doing it. The expansion mechanism 8 includes a regenerator 10 pipe-connected in series with a connection point 9 of the pipes 3 and 6, and an expander 11 pipe-connected in parallel with the regenerator 10, and the inside of the expander 11 is a displacer 12 Is partitioned into an upper space 13 and a lower space 14.

When the compressor 2 is operated and the inlet side valve 5 is opened (the outlet side valve 7 is closed), the working gas discharged from the compressor 2 enters the upper space 13 and the lower space 14 inside the expander 11. At this time, the displacer 12 is at the bottom dead center. When the displacer 12 moves to the top dead center, the working gas in the upper space 13 moves to the lower space 14 through the regenerator 10. Next, when the outlet side valve 7 is opened (the inlet side valve 5 is closed), the lower space
The working gas of 14 expands and is absorbed by the compressor 2 while being cooled. At this time, the regenerator 10 stores the cold by passing the cooled working gas. After that, the outlet valve 7 is closed, the displacer 12 moves to the bottom dead center, and returns to the initial state. By repeating the above operation,
As the cool storage of the regenerator 10 progresses, the temperature of the working gas in the lower space 14 decreases.

(C) Problems to be solved by the device Since the adsorber 4 is provided only in the discharge side pipe 3 of the compressor 2 in the above-mentioned GM cycle refrigerator (cooling type refrigerating device), the operation by the adsorber 4 is performed. Gas cleaning is strictly required, and there is a problem that the adsorber 4 must be large-sized and the adsorber 4 must be frequently replaced. Further, when impurities such as oxygen or nitrogen in the working gas pass through the regenerator 10 and flow into the lower space 14 of the expander 11, the temperature of the lower space is lowered, so that the impurities are frozen and the displacer 12 is removed. There is a risk that the expander 11 may be locked and the operation of the expander 11 may be stopped. In addition, other types of cold storage refrigeration systems also have similar problems.

This invention was made in view of the above-mentioned fact,
The object of the present invention is to reduce the size of the adsorber, extend the service life of the adsorber, and avoid abnormal stoppage of the expander due to impurities in the working gas.

(D) Means for Solving the Problems This invention relates to a regenerative refrigeration system equipped with a compression mechanism, and an expansion mechanism in which a regenerator and an expander are connected in an annular pipe to the compression mechanism. This is a configuration in which an adsorber is provided in the gas flow path from the expansion space of the container to the end of the regenerator on the expanded gas inflow side.

(E) Action Since the working gas supplied from the compression mechanism to the expansion mechanism has a high pressure, impurities contained in the working gas are efficiently adsorbed by the adsorber when the working gas passes through the circuit of the regenerator.
Since the working gas recovered from the expansion mechanism to the compression mechanism has a low pressure, when the working gas passes through the circuit of the regenerator, the impurities adsorbed in the adsorber desorb from the adsorber and are compressed together with the working gas. Recovered by the mechanism. Further, the temperature of the adsorber provided in the flow path through which the cooled expansion gas (working gas) from the expansion space of the expander flows is lowered, and when the working gas flows from the regenerator to the expansion space of the expander. Since impurities such as oxygen or nitrogen are adsorbed on the adsorber, the adsorption performance is greatly improved and malfunction of the expander is avoided.

In this way, in the adsorber provided in the gas flow path from the expansion space of the expander to the expansion gas inflow side end of the regenerator, impurities are repeatedly adsorbed and desorbed, so that the capacity of the adsorber can be reduced and The service life of the vessel also becomes longer. Further, the impurities are surely adsorbed to the adsorber whose temperature has dropped, and low-temperature freezing can be performed without any trouble.

(F) Embodiment An embodiment in which the present invention is applied to a GM cycle refrigerator will be described below with reference to the drawings.

FIG. 1 shows a regenerator (GM cycle refrigerator) according to an embodiment of the present invention. In FIG. 1, the compression mechanism 15 is such that a first adsorber 18 and an inlet side valve 19 are sequentially installed in a discharge side pipe 17 of a compressor 16, and a suction side pipe of the compressor 16 is installed.
The outlet side valve 21 is installed at 20. Expansion mechanism 22 is piping
A regenerator 25 connected in series with a connection point 23 of 17 and 20,
The regenerator 25 and an expander 26 connected in parallel to each other are provided, and the expander 26 and the regenerator 25 are connected to each other in an annular shape by piping. The inside of the expander 26 is divided by the displacer 27 into an upper space 28 and a lower space 29 which is an expansion space in which the working gas expands.

Reference numeral 30 denotes a second adsorber, which is attached integrally with the regenerator 25 at the rear portion of the regenerator 25, that is, at the end on the lower space 29 side into which the expanded and cooled working gas flows. ing. The filler used in the second adsorber 30 is preferably one that is less likely to wear due to vibration due to the pressure difference. For example, alumina or activated carbon in a honeycomb shape or activated carbon in a fibrous shape is suitable. .

According to this embodiment, the high-pressure working gas supplied from the compression mechanism 15 to the expansion mechanism 22 flows through the second adsorber 30, so that the oil and impurities contained in the working gas are absorbed in the second adsorber 30.
Are efficiently adsorbed on the lower space 29, and the cooling action in the lower space 29 can be performed without any trouble. In addition, from the expansion mechanism 22 to the compression mechanism
Since the working gas returned to 15 has a low pressure, when the working gas passes through the adsorber 30, the oil and impurities adsorbed by the second adsorber 30 are separated from the second adsorber 30, and the compression mechanism 15 Be recovered. For this reason, the amount of oil and impurities accumulated in the second adsorber 30 becomes small, and the second adsorber 30 can be downsized and its service life can be extended while efficiently performing low-temperature refrigeration.

Further, a low-temperature working gas flows from the lower space 29 to the second adsorber 30, the second adsorber 30 is cooled and used in a low temperature state, and impurities in the working gas passing through the regenerator 25 are the second adsorber. Since it is adsorbed by 30, the adsorption performance of the second adsorber 30 can be further enhanced, and impurities such as oxygen or nitrogen in the working gas can be adsorbed by the second adsorber 30 without fail, and the expander 26 It is possible to prevent the displacer 27 from freezing and prevent the expander 26 from abnormally stopping.

The same effect can be expected even if the second adsorber is attached to the pipe between the regenerator 25 and the lower space 29 of the expander 26.

In the above-mentioned embodiment, the embodiment in which the present invention is applied to the GM cycle refrigerator has been described.
It can be applied to various regenerators in which working gas repeatedly flows in and out with an expansion mechanism having a regenerator.

(G) Effect of the device Since the device of the present invention is configured as described above, the expansion mechanism using the adsorber provided in the gas flow path from the expansion space of the expander to the end of the regenerator on the expansion gas inflow side. The impurities contained in the working gas flowing into the chamber can be efficiently removed, and low-temperature refrigeration can be performed without any hindrance, and the impurities adsorbed in the adsorber when the working gas flows out of the expansion mechanism are released to remove the impurities. The size of the adsorber can be reduced and the service life of the adsorber can be increased, and since the adsorber is used in a low temperature state, impurities such as oxygen and nitrogen can be adsorbed with certainty. The operation of the expander can be stabilized by avoiding freezing in the expander, and the economy, serviceability and stability are excellent.

[Brief description of drawings]

FIG. 1 is a system diagram of a cold storage type refrigerating apparatus showing an embodiment of the present invention, and FIG. 2 is a system diagram showing an example of a conventional apparatus. 15 ... compression mechanism, 22 ... expansion mechanism, 30 ... second adsorber (adsorber), 25 ... regenerator, 26 ... expander, 29 ... lower space (expansion space).

Claims (1)

[Scope of utility model registration request] 1. A regenerator having a compression mechanism and an expansion mechanism which is connected to the compression mechanism by piping to connect a regenerator and an expander to each other in an annular manner. The regenerator is expanded from an expansion space of the expander. A regenerator with a regenerator characterized in that an adsorber is provided in a gas flow path to an end of the gas inflow side.